It would be better to fuck the mother and daughter together. Put your bare cock in one and then the other. You could compare the size of their cunts. The mother would watch closely as you cum in and fertilize her daughter and the daughter would watch closely as her mother was inseminated. They would both be fertile and impregnated by they would be bred throughout the night. Both women would give birth to healthy babies and would nurse each others babies. Her husband would be angry that they were bred by a big White cock.